Crank-pin bearing



July '13, 1948. 4 E. M; FISK 2,445,025

CRANK-PIN BEARING I Original Filed May 19, 1941 wvll 1y receive the slippers Patented July 13, 1948 2,445,025 esteem BEARING Edwin M.-Fisk, Mission San Jose, Calif,

Original application May 19, 1941; Serial No.

394,097. Divided and thisapplication Novem =ber 15, 1943, Serial The invention relates to a crank pin bearing particularly adapted for use in radial type internal combustion engines, and the present application comprises a division of my application Serial No. 394,097, filed May 19, 1941, which application issued into Patent No. 2,334,185 on N ovember 16, 1943.

An object of the invention is to provide a rugged and simple bearing connection for a plurality of connecting rods at a common crankpin or the like.

Another object is to provide an improved crankpin bearing means which is particularly adapted for use with a plurality of generally co planar connecting rods of a radial engine.

The invention possesses other objects and features of invention, some Of which, with the foregoing, will be set forth or be apparent in the following description of a typical embodiment thereof, and in the accompanying drawings, in which,

Figure 1 is a fragmentary longitudinal section taken through a crankshaft having its crankpin provided with the present bearing.

Figure 2 is a fragmentary sectional view at the line 2-2 in Figure 1.

Figure 3 is a plan view of the showing of Figure 2.

The present bearing structure has been particularly designed for use with a crankshaft 15 arranged to be driven by pistons H which are operative in cylinders l8 radiating from the cranksh'aft axis in a common plane and connected to the same throw offset .or crankpin l9 of the shaft by connecting rods 20, the cylinder plane being perpendicular to the crankshaft aris. The crankpin I!) may be counterbalanced by weighted shaft extensions extending radially from the opposite side of the shaft and spaced axially along the shaft to permit the operation of the connectin rods 20 between them.

As illustrated, the crankpin bearing of my invention essentially comprises a floating sleeve or bushing I l I mounted on the crankpin l9 and externally engaged at circumferentially spaced points thereabout by complementary slipper ends H2 of the connecting rods 20, said slippers being held in place by floating rings H3 at their opposite ends. The bearing sleeve H=l is preferably formed of a softer metal, such as bronze, than are the crankpin and connecting rod slippers, and is disposed in an annular circumferential seat groove of the crankpin in which it is rotatable while it is retained against axial shifting by the groove ends. The sleeve III is generally spoolshaped, having radial end flanges H4 which free- HZ between them against No. 510.355 3 Claims. (01. ii- 580 axial displacement of the slippers. The slippers H2 have cylindrically convex faces at opposite sides of their rods for complementarily engaging the bores of the rings H3 which are arranged for their retention in operative engagement with the slippers by their engagement between the rods and the sleeve flanges H4 which extend beyond the outer slipper faces.

The present bearing sleeve III is axially split to provide sections which have their opposed edges mortised or rabbeted together with complementary sets of tenons H5 for interengagement in their lines to secure the sections against relative axial movement. Screw pins H5 extend through registering bores provided in the aligned tenons H5 of the assembled sleeve whereby the sleeve may be mounted in the groove of the crankpin for its free rotation about the pin. The rings H3 are also diametrically split, and have their sections secured together by bolts H1 which are operative tangentially of and between the section ends to secure them together without effecting a tight engagement of the rings with the outer faces of the slippers. It will thus be understood that the sleeve l H truly floats between the slippers and crankpin, and that the present bipartite structures for the sleeve Ill and the retaining rings H3 provides a crankpin bearing structure for a plurality of rods which may be assembled or disassembled with particular readiness.

From the foregoing description taken in connection with the accompanying drawings, the advantages of the construction and use of the present bearing will be readily understood by those skilled in the art to which the invention appertains. While I have described the features and principles of operation of an assembly which I now consider to comprise a preferred embodiment of my invention, I desire to have it understood that the showing is primarily illustrative, and that such changes may be made, when desired, as fall within the scope of the following claims.

I 'claim:

1. In combination with a shaft or the like providing an annular bearing groove therearound, a bearing sleeve floating in said shaft groove against axial shifting in the groove and comprising radially separable sections rabbeted together at their opposed edges and positively and releasably fixed together by pins extending axially through their rabbets.

2. In combination with a shaft or the like providing an annular bearing groove therearound, a bearing sleeve fittedly floating in said shaft groove and extending outwardly from the groove and izoi'n'prising' radially separable sections rabbeted together at their opposed edges and positively ing sleev'e fi tedly floating in said crankpin groove and ei'ttending outwardly from the groove and providing an exterior bearing groove for the complementary engagement therein and circumfer entially therearound of the bearing slippersof the different connecting r0ds,-said= sle'evecomal prising radially separable sections 'rabbetedtor-l Numberi V gether at their opposed edges and positively and i releasably fixed together in the crankpingroove by pins extending axially through their rabbets outwardly of the crankpin groove and inwardly of the sleeve groove.

EDWIN M. FISK.

REFERENCES CITED The following references areof record in the file of thispatent: 4

Number UNITED STATES PATENTS Name Date Ryan Mar. 6, 1888 Miller Oct. 19, 1937 FOREIGN PATENTS Gountry Date Great Britain June 17, 1936 Great Britain July 5, 1938 France Mar. 19, 1929 

